Axial pressing device used after winding of large-size transformer coil

Abstract

The invention belongs to an axial pressing device used after winding of a large-size transformer coil. The device solves the problem of a large stroke of equipment by replacing a screw rod with oil cylinders, and the oil cylinders have better rigidity and strength. The parallelism of the equipment is subjected to position control by taking a rolling grating as a displacement sensor, and the position precision is fed back to an electro-hydraulic servo valve by a control system, so the high-precision synchronous control on four sets of oil cylinders is realized. The axial pressing device used after winding of the large-size transformer coil has the characteristics of being novel and unique in integral structure, concise and attractive in appearance, small in occupation area and the like. The pressed coil has precise height and accurate pressure value, the coil pressing process is safe and reliable, and the insulation of the coil can be completely kept. The axial pressing device used after the winding of the large-sized transformer coil is particularly suitable for pressing high-voltage and ultrahigh-voltage coils.

Description

Technical field [0001] The invention is an axial compression device used for winding large transformer coils, and belongs to the technical field of electromechanical equipment. Background technique [0002] In the manufacturing process of large transformers, such as AC 110KVA, 220KVA, 500KVA, up to 1000KVA and DC 800KVA and large-capacity reactors and other large transformers, the size and weight of these large transformer coils are relatively large, generally the diameter is 0.5m~3m, and the weight There are 5t~50t, and the compression force during axial compression is generally 100kN~4200kN. [0003] In the transformer manufacturing process, there is an axial compression process, that is: the transformer coil wound with copper wire needs to be axially compressed, and the compression force on the transformer coil during the compression process, the axial compression size and the two surfaces of the equipment The parallelism between the positions has high requirements. [0004] Tra...

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of equipment is that due to the influence of the stiffness of the screw itself, the stroke of the equipment is small (generally no more than 2m), the parallelism between the movable platen and the lower platen of the equipment is low, and it is not easy to realize closed-loop control

Since the coil is pressurized by a single cylinder, the position placement requirements are strict, so the equipment cannot adapt to large partial loads

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